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Table 5 Regression model for square root of average PB-PAH exposures of each subject in major time-activity categories (indoor, in-vehicle, and other) across all the sampling sessions (N = 74 a ; R 2= 0.76; adjusted R 2= 0.75)

From: Modeling personal particle-bound polycyclic aromatic hydrocarbon (pb-pah) exposure in human subjects in Southern California

  Beta Standard error p-value Partial R2 VIF
Intercept 1.29 1.18 0.2776   0
GPS speed (sqrt) 0.82 0.11 <.0001 0.67 1.62
Indoor (yes/no) −1.75 0.58 0.0039 0.07 1.72
Percent of daytime 3.87 1.48 0.0108 0.02 1.65
  1. aWe excluded 6 records that lasted for less than 60 min in total for a particular time-activity category (i.e. indoor, in-vehicle travel, and other).